International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C. ch. 2.2, p. 36

Figure 2.2.6.1 

J. R. Helliwella

a Department of Chemistry, University of Manchester, Manchester M13 9PL, England

[Figure 2.2.6.1]
Figure 2.2.6.1

Normal-beam equatorial geometry: the angles ω, χ, φ, 2θ are drawn in the convention of Hamilton (1974[link]).